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differential lubricant

Carol Brooks Just learning to care for my tractor since my husband's death. I need to top off the differential lubricant in my 1958 Massey Ferguson TO35. The manual says to use 90 weight mineral gear oil. The only mineral lubricant I can find is 90 weight mineral transmission fluid, not gear oil. If it is 90 weight, is gear oil and transmission fluid the same thing?
Pete Generally SAE90 oil is used in manual gearboxes and diff's. There would be no harm in using a multi viscosity oil like a 80w-140 either.
Carol Brooks Pete, is 90 weight gear oil the same thing as 90 weight transmission fluid? I can find mineral transmission fluid but cannot find a product that says mineral gear oil.

Pete I guess it comes down to where you are.

Here 90wt gear oil would normally be called gear/diff oil. Transmission fluid normally refers to automatic gearboxes but none of them I know take anything close to 90 weight oil.

However elsewhere it may also be called Manual Transmission oil. Google the oil you have found and see if it suitable for diff's

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